1. equivocal, ambiguous -- (open to two or more interpretations; or of uncertain nature or significance; or (often) intended to mislead; "an equivocal statement"; "the polling had a complex and equivocal (or ambiguous) message for potential female candidates"; "the officer's equivocal behavior increased the victim's uneasiness"; "popularity is an equivocal crown"; "an equivocal response to an embarrassing question")
2. ambiguous -- (having more than one possible meaning; "ambiguous words"; "frustrated by ambiguous instructions, the parents were unable to assemble the toy")
3. ambiguous -- (having no intrinsic or objective meaning; not organized in conventional patterns; "an ambiguous situation with no frame of reference"; "ambiguous inkblots")

1.

As Plants ambiguous between Sea and Lan. - from Paradise Lost by John Milton

2.

So scoffing in ambiguous words, he scarc. - from Paradise Lost by John Milton

3.

Or such ambiguous giving out, to not. - from The Complete Works of William Shakespeare by William Shakespeare

4.

Miss Lydia uttered a little, ambiguous squeak and crumpled her program in her hand. - from The Best American Humorous Short Stories by Various

Interpreting this ambiguous reply to signify the third summer, Hyllus controlled his impatience for three years, when, having collected a powerful army, he once more entered the Peloponnesus. - from Myths and Legends of Ancient Greece and Rome by E.M. Berens

7.

The comparison of the various qualities of shadows and lights not infrequently seems ambiguous and confused to the painter who desires to imitate and copy the objects he sees. - from The Notebooks of Leonardo Da Vinci, Complete by Leonardo Da Vinci

8.

The ambiguous phrase by means of which Montparnasse had warned Gavroche of the presence of the policeman, contained no other talisman than the assonance dig repeated five or six times in different forms. - from Les Miserables by Victor Hugo